CN106270883B - A kind of connection method of PDC and hard alloy - Google Patents
A kind of connection method of PDC and hard alloy Download PDFInfo
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- CN106270883B CN106270883B CN201610763961.7A CN201610763961A CN106270883B CN 106270883 B CN106270883 B CN 106270883B CN 201610763961 A CN201610763961 A CN 201610763961A CN 106270883 B CN106270883 B CN 106270883B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/206—Cleaning
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Abstract
A kind of connection method of PDC and hard alloy, for the solder used for AgCuNi brazing filler metals, AgCuNi brazing filler metals have the excellent performances such as higher intensity, plasticity.Present invention utilizes AgCu brazing filler metal melts temperature is low, AgCuNi solders have the advantages of good wettability to hard alloy, under the welding temperature of AgCu solders, form the seaming zone of the AgCuNi components of the function admirable of connection hard alloy, spreading PDC at a lower temperature is realized, ensure that the performance of PCD parts is injury-free.Method technique itself is simple, with short production cycle, manufacture cost is low, can realize batch production, and good practical effect is easy to utilize.
Description
Technical field
The present invention relates to the interconnection technique field of dissimilar material, specifically a kind of connection side of PDC and hard alloy
Method and the large scale PDC prepared using the method.
Background technology
Composite polycrystal-diamond (polycrystalline diamond compact, abbreviation PDC).PDC generally uses
Diadust and a small amount of metal powder are sintered with cemented carbide substrate under the conditions of high pressure high temperature to be formed.Diadust with
The part sintered at high temperature under high pressure after a small amount of metal dust mixing is referred to as polycrystalline diamond
（Polycrystalline diamond, abbreviation PCD）.PDC has the high rigidity of diamond, high-wearing feature and excellent heat conduction
Property, and intensity and toughness with hard alloy, therefore be manufacture cutting tool, drilling bit and other wear resistant tools
Ideal material.PDC is typically all using cubic apparatus or the Special purpose pressing machine manufacture of two sides top.The size of PDC depends on the big of press
It is small, large scale（Refer to that length is longer in the present invention）PDC need more high-power, large-tonnage press, it is necessary to bigger pressure
It is prepared with the parameter such as the sintering temperature of higher.It has to be noted that the low production efficiency of large scale PDC, production cost
It is very high.In addition, the PDC of some nonstandard sizes needs special equipment, production cost higher, or even can not produce.Constrain
The extensive use of PDC.To solve the above-mentioned problems, existing frequently-used method is the method using welding.Using small scale（This hair
Refer to that length is shorter in bright）It is common selection that PDC is brazed the preceding paragraph hard alloy again.In atmosphere, more than 700 degrees Celsius just by PCD
Fire damage can be produced, in a vacuum, more than 800 degrees Celsius can produce fire damage.PCD caused by brazing temperature height of the prior art
Fire damage the performance of PDC can be caused to weaken, and then influence PDC composite sheets quality.
The content of the invention
In order to solve the above technical problem, the present invention provides the connection method of a kind of PDC and hard alloy.This method is led to
The selection of solder and the assurance of soldering process step and parameter are crossed, realizes and completes PDC and hard alloy at a lower temperature
Welding spreading process, meanwhile, the PCD not heat damages, also, the seam after spreading has higher intensity on PDC.
The present invention is that technical solution is used by solving above-mentioned technical problem：A kind of connection side of PDC and hard alloy
Method, comprises the following steps：
Step 1: cleaned respectively to the connected face of PDC and hard alloy, after air-drying, the PDC of cleaning and hard is obtained
Matter alloy, it is spare；
Step 2: the method being modified using surface is respectively to the PDC after step 1 cleaning and the connected face of hard alloy
It is modified, the connected face of PDC and hard alloy is formed one layer of nickel coating；
Step 3: placing one layer of solder between step 2 PDC after modified and the connected face of hard alloy, obtain
Assembling assembly, it is spare；
The solder is less than 800 DEG C of AgCu solders for liquidus curve；
Step 4: assembling assembly made from step 3 is positioned in vacuum drying oven, it is 10 to be evacuated to vacuum in stove-1~
10-3MPa, afterwards, control the temperature in vacuum furnace are increased to 775~800 DEG C with certain heating rate, and keep the temperature at such a temperature
1~3min, then, control the temperature in vacuum furnace are cooled to 680~710 DEG C, and carry out 40~80min of insulation at such a temperature,
Afterwards, the temperature in vacuum furnace cooled to room temperature is controlled, assembling assembly is taken out, that is, completes the company between PDC and hard alloy
Connect.
In step 1, the method cleaned to the connected face of PDC and hard alloy is：By PDC and hard alloy
It is put into be placed in ethanol solution and carries out 10~15min of ultrasonic cleaning.
In step 2, the thickness of the nickel coating is 0.1-2mm.
In step 3, AgCu solders used are AgCu eutectic solders.
In step 4, the eutectic in vacuum drying oven using the maximum temperature that certain heating rate heats up as AgCu eutectic solders
Temperature.
In step 4, after being warming up to maximum temperature in vacuum drying oven with certain heating rate, the time of insulation is 3min.
In step 4, the temperature after vacuum descent of temperature is 710 DEG C, and soaking time at such a temperature is 80min.
In step 4, the heating rate is 5-15 DEG C/min.
A kind of connection method of PDC and hard alloy, comprises the following steps：
Step 1: cleaned respectively to the connected face of PDC and hard alloy, after air-drying, the PDC of cleaning and hard is obtained
Matter alloy, it is spare；
Step 2: one layer of metal powder is placed between PDC of the step 1 after over cleaning and the connected face of hard alloy,
Assembling assembly is obtained, it is spare；
The metal powder is the mechanical impurity of AgCu eutectic solders powder and nickel powder, wherein, nickel powder accounts for the total matter of metal powder
The 15%-20% of amount；
Step 3: assembling assembly made from step 2 is positioned in vacuum drying oven, it is 10 to be evacuated to vacuum in stove-1~
10-3MPa, afterwards, control the temperature in vacuum furnace are increased to 775~800 DEG C with certain heating rate, and keep the temperature at such a temperature
1~3min, then, control the temperature in vacuum furnace are cooled to 680~710 DEG C, and carry out 40~80min of insulation at such a temperature,
Afterwards, the temperature in vacuum furnace cooled to room temperature is controlled, assembling assembly is taken out, that is, completes the company between PDC and hard alloy
Connect.
Beneficial effect：
1st, the connection method of a kind of PDC and hard alloy of the invention, the solder used is AgCuNi brazing filler metal, AgCu prickers
Material has relatively low fusion temperature, and AgCuNi brazing filler metals have hard alloy good wettability.Compared with AgCu solders, the present invention
The AgCuNi brazing filler metals of use have the excellent performances such as higher intensity, plasticity.It can be seen from AgCuNi ternary alloy phase diagrams
A small amount of Ni is added in AgCu alloys, the fusion temperature of AgCuNi alloys can be higher by much than AgCu alloy.In soldering hard
When alloy is with PDC, excessive temperature can cause to damage to the PCD parts on PDC, so as to influence the performance of PDC.The present invention utilizes
AgCu brazing filler metal melts temperature is low, and AgCuNi solders have the advantages of good wettability to hard alloy, in the weldering of AgCu solders
Under jointing temp, the seaming zone of the AgCuNi components of the function admirable of connection hard alloy is formd, is realized at a lower temperature
Spreading PDC, ensure that the performance of PCD parts is injury-free.
2nd, the connection method of a kind of PDC and hard alloy of the invention have the advantages that brazing and diffusion welding.Connection procedure
In do not have to brazing flux, no brazing flux residual, ratio of brazing area is high；After warm diffusion, bonding strength is sufficient for the PDC uses after spreading.
Meanwhile method technique itself is simple, with short production cycle, manufacture cost is low, can realize batch production, good practical effect, easy to push away
Wide application.
Brief description of the drawings
Fig. 1 is the decomposition texture schematic diagram of assembling assembly I in the embodiment of the present invention；
Fig. 2 is the structure diagram of assembling assembly I in the embodiment of the present invention；
Fig. 3 is the structure diagram of assembling assembly II in the embodiment of the present invention；
Fig. 4 is the PCD electron microscopes on PDC before spreading；
Fig. 5 is the PCD electron microscopes on PDC after spreading；
Reference numeral：1st, PDC, 101, nickel coating I, 2, AgCu solders, 3, hard alloy, 301, nickel coating II, 4, metal
Powder.
Embodiment
Further details of illustration and description are done to technical scheme with specific embodiment below in conjunction with the accompanying drawings.
The connection method of a kind of PDC and hard alloy disclosed by the invention, including two kinds of specific embodiments：
First, a kind of connection method of PDC and hard alloy, comprises the following steps：
A. clean：PDC1 and hard alloy 3 are put into supersonic wave cleaning machine and carry out 10~15min of cleaning, cleaning terminates
Dried up afterwards with hair-dryer；
B. surface is modified：The method being modified with surface is modified the connected face of PDC1 and hard alloy 3, makes to be connected
Nickel coating is formed in junction.Wherein, the non-PCD ends of PDC are the face that is connected.It is modified to form nickel coating in one end of PDC1,
101, form nickel coating II 301 in one end of hard alloy 3.To prevent the PCD of one end on PDC1 not heat damages, PDC1 is connected
Junction cannot use the higher surface modifying method of temperature, can use the methods of electroplating in connected face nickel plating.And hard alloy 3 has
The ability of higher heat resistanceheat resistant damage, can use the method plating last layer nickel of such as thermal spraying.
C. assemble：The nickel coating II 301 on the nickel coating I 101 and hard alloy 3 on PDC 1 after will be surface-modified
Relatively, and between nickel coating I 101 and nickel coating II 301 one layer of AgCu solder 2 is put, the AgCu solders, its liquidus temperature is low
In 800 DEG C.When selecting AgCu solders, AgCu binary phase diagramls are may be referred to determine that the liquidus temperature of selected solder is less than
800℃。
D. heat：The heating process carries out in vacuum atmosphere, and the vacuum of the vacuum atmosphere is 10-1-10- 3MPa, the maximum temperature of heating is 775 DEG C -800 DEG C, and 1min-3min is kept the temperature in maximum temperature.After AgCu brazing filler metal melts, plating
Nickel on nickel layer I and nickel coating II can be quickly fused into the AgCu solders of liquid, form AgCuNi solders.AgCuNi have compared with
High intensity and shock resistance.In addition, solder, in heating process, high-temperature residence time is very short, even PCD parts by
Fire damage, since high-temperature residence time is very short, suffered fire damage is also very little.
E. keep the temperature：Temperature is down to 680 DEG C -710 DEG C, in this temperature 40min-80min.In this temperature range, PCD 1
Fire damage will not be produced, after warm diffusion a period of time, the component of seaming zone is more uniformly distributed, the hard of seaming zone and its both ends
The Joint Properties of alloy are more preferable.
As a preferred embodiment, the thickness of the nickel coating I in step b and nickel coating II is 0.1-2mm.Tune can be passed through
The thickness of this whole nickel coating adjusts the component of final seaming zone.
As a preferred embodiment, the AgCu solders in step c are AgCu eutectic solders.AgCu eutectic solders are that AgCu is closed
Jin Zhong, the minimum component of fusion temperature, its fusing point is low, and when crystallization does not have temperature interval.
As a preferred embodiment, the maximum temperature of heating is the eutectic temperature of AgCu eutectic solders.Reach altogether in temperature
After brilliant temperature, AgCu eutectic solders are all fused into rapidly liquid, and the nickel coating contacted with liquid AgCu eutectic solders is molten rapidly
Solution forms AgCuNi alloys into liquid AgCu eutectic solders.
Present invention also offers a kind of PDC by above method spreading.PDC prepared by the method for the present invention, can be flexible
Adjust the length of cemented carbide base.
2nd, a kind of connection method of PDC and hard alloy, comprises the following steps：
A. clean：PDC1 and hard alloy 3 are put into supersonic wave cleaning machine and carry out 10~15min of cleaning, cleaning terminates
Dried up afterwards with hair-dryer；
B. assemble：One layer of metal powder is put between the connected face of PDC 1 after cleaning and the connected face of hard alloy 3
4, the metal powder 4 is AgCu eutectic solders powder and the mechanical impurity of nickel powder；
C. heat：The PDC1 and hard alloy 3 assembled is heated, the heating process in vacuum atmosphere into
OK, the vacuum of the vacuum atmosphere is 10-1-10-3MPa, the maximum temperature of heating is 775 DEG C -800 DEG C, is protected in maximum temperature
Warm 1min-3min.AgCuNi in metal powder 4 can be merged mutually, be formed with higher intensity and shock resistance
AgCuNi。
D. keep the temperature：Temperature is down to 680 DEG C -710 DEG C, in this temperature 40min-80min.
Embodiment 1：
PDC and hard alloy are put into supersonic wave cleaning machine and clean 15min, is dried up after cleaning with hair-dryer；
The non-PCD ends of PDC are the face that is connected, and the nickel coating that a layer thickness is 0.2mm is plated on the face of being connected with electric plating method,
On the connected face of hard alloy the nickel coating of one layer of 0.2mm thickness is plated with the method for thermal spraying.By the nickel coating and hard on PDC
Nickel coating on alloy is opposite, and one layer of Ag75Cu solder is put between nickel coating and nickel coating（Ag75Cu refers to the weight of silver
Amount account for 75%, copper weight account for 25% brazing filler metal alloy）.PDC after assembling, solder, hard alloy are holded up and are put into vacuum drying oven
In, vacuum reaches 10 in vacuum drying oven-1Begun to warm up after MPa, 800 DEG C, 800 DEG C are heated to the heating rate of 5 DEG C/min
For maximum heating temperature in the present embodiment.Keep the temperature 1min at 800 DEG C, furnace temperature be then down to 680 DEG C, keep the temperature 60min, then with
Furnace cooling is but.The PDC after spreading is taken out, nickel coating I and nickel coating II disappear at this time, form a complete seaming zone, and connect
Seam area engages well with the hard alloy surface at its both ends.
Before Fig. 4, Fig. 5 are respectively spreading（Before being heated）After PCD and spreading on PDC（After being heated）PCD electricity on PDC
Mirror picture.As can be seen that the PCD parts before spreading and the PCD parts after heating spreading are without obvious from electron microscopic picture
Difference, it was demonstrated that the upper PCD of the PDC after spreading does not have fire damage to produce or produced without obvious fire damage.With this side
The PDC of method spreading makes PDC drill bit in oil drilling, it drills through efficiency and service life with being processed and formed at one time with cubic hinge press
The PDC drill bits that do of PDC it is suitable.
Embodiment 2：
PDC and hard alloy are put 10min is cleaned in supersonic wave cleaning machine, dried up after cleaning with hair-dryer；Electricity consumption
The method of plating plates at the non-PCD ends of PDC the nickel coating I that a layer thickness is 0.15mm, in one end thermal spraying of hard alloy
Method plates the nickel coating II of one layer of 0.15mm thickness.Nickel coating II on nickel coating I and hard alloy on PDC is opposite, and
One layer of Ag72Cu eutectic solder is put between nickel coating I and nickel coating II.PDC after assembling, solder, hard alloy are holded up
It is put into vacuum drying oven, vacuum reaches 10 in vacuum drying oven-3Begin to warm up after MPa, be heated to the heating rate of 10 DEG C/min
779℃（The eutectic temperature of AgCu eutectic solders, might have according to stove difference and the somewhat difference of solder component, this temperature
It is different）, 3min is kept the temperature, furnace temperature is then down to 680 DEG C, keeps the temperature 80min, subsequent furnace cooling.The PDC after spreading is taken out, this
When, nickel coating I and nickel coating II disappear, and form a complete seaming zone, and the hard alloy surface of seaming zone and its both ends
Engagement is good.
The heating-up temperature of the present embodiment is less than embodiment one, and fire damage phenomenon is not observed in the PCD in embodiment one,
Relatively low temperature will not more produce fire damage in the present embodiment.
Embodiment 3：
PDC and hard alloy are put 10min is cleaned in supersonic wave cleaning machine, dried up after cleaning with hair-dryer；
PDC is connected face and hard alloy is connected between face and puts one layer of metal powder, and the thickness of metal powder 5 is 2mm, the metal powder
Weight ratio for the mechanical impurity eutectic solder powder and nickel powder of AgCu eutectic solders powder and nickel powder is 5 to 1.Afterwards, will assemble
Component is put into vacuum drying oven, and vacuum reaches 10 in vacuum drying oven-3Begin to warm up after MPa, added with the heating rate of 10 DEG C/min
Heat is to 779 DEG C（The eutectic temperature of AgCu eutectic solders, may according to stove difference and the somewhat difference of solder component, this temperature
Have difference）, 3min is kept the temperature, furnace temperature is then down to 710 DEG C, keeps the temperature 80min, subsequent furnace cooling.After taking out spreading
PDC, forms a complete seaming zone, and the hard alloy surface of seaming zone and its both ends after the heated insulation of mechanical mixture powder
Engagement is good.
Embodiment 4：
PDC and hard alloy are put into supersonic wave cleaning machine and clean 13min, is dried up after cleaning with hair-dryer；
The non-PCD ends of PDC are the face that is connected, and the nickel coating that a layer thickness is 0.1mm is plated on the face of being connected with electric plating method,
On the connected face of hard alloy the nickel coating of one layer of 0.1mm thickness is plated with the method for thermal spraying.By the nickel coating and hard on PDC
Nickel coating on alloy is opposite, and one layer of Ag74Cu solder is put between nickel coating and nickel coating.By the PDC after assembling, pricker
Material, hard alloy are holded up and are put into vacuum drying oven, and vacuum reaches 10 in vacuum drying oven-2Begun to warm up after MPa, with 15 DEG C/min
Heating rate be heated to 775 DEG C, 775 DEG C are maximum heating temperature in the present embodiment.3min is kept the temperature at 775 DEG C, then by stove
Temperature drop keeps the temperature 40min, subsequent furnace cooling to 710 DEG C.The PDC after spreading is taken out, nickel coating I and nickel coating II disappear at this time,
A complete seaming zone is formed, and seaming zone engages well with the hard alloy surface at its both ends.
Embodiment 5：
PDC and hard alloy are put into supersonic wave cleaning machine and clean 11min, is dried up after cleaning with hair-dryer；
The non-PCD ends of PDC are the face that is connected, and the nickel coating that a layer thickness is 2mm are plated on the face of being connected with electric plating method, hard
On the connected face of matter alloy the nickel coating of one layer of 2mm thickness is plated with the method for thermal spraying.By the nickel coating and hard alloy on PDC
On nickel coating it is opposite, and one layer of Ag73Cu solder is put between nickel coating and nickel coating）.By the PDC after assembling, solder,
Hard alloy, which is holded up, to be put into vacuum drying oven, and vacuum reaches 10 in vacuum drying oven-2Begun to warm up after MPa, with the liter of 12 DEG C/min
Warm speed is heated to 780 DEG C, and 780 DEG C are maximum heating temperature in the present embodiment.2min is kept the temperature at 780 DEG C, then drops furnace temperature
To 710 DEG C, 80min, subsequent furnace cooling are kept the temperature.The PDC after spreading is taken out, nickel coating I and nickel coating II disappear at this time, are formed
One complete seaming zone, and seaming zone engages well with the hard alloy surface at its both ends.
Embodiment 6：
PDC and hard alloy are put 12min is cleaned in supersonic wave cleaning machine, dried up after cleaning with hair-dryer；
PDC is connected face and hard alloy is connected between face and puts one layer of metal powder, and the thickness of metal powder 5 is 0.8mm, the metal
Powder is the mechanical impurity eutectic solder powder of AgCu eutectic solders powder and nickel powder and the weight ratio of nickel powder is 17:3.Afterwards, will fill
Distribution assembly is put into vacuum drying oven, and vacuum reaches 10 in vacuum drying oven-2Begun to warm up after MPa, with the heating rate of 10 DEG C/min
It is heated to 775 DEG C（The eutectic temperature of AgCu eutectic solders, according to stove difference and the somewhat difference of solder component, this temperature can
Difference can be had）, 2min is kept the temperature, furnace temperature is then down to 690 DEG C, keeps the temperature 40min, subsequent furnace cooling.After taking out spreading
PDC, forms a complete seaming zone, and the hard alloy surface of seaming zone and its both ends after the heated insulation of mechanical mixture powder
Engagement is good.
Embodiment 7：
PDC and hard alloy are put 15min is cleaned in supersonic wave cleaning machine, dried up after cleaning with hair-dryer；
PDC is connected face and hard alloy is connected between face and puts one layer of metal powder, and the thickness of metal powder 5 is 0.1mm, the metal
Powder is the mechanical impurity eutectic solder powder of AgCu eutectic solders powder and nickel powder and the weight ratio of nickel powder is 4:1.Afterwards, will assemble
Component is put into vacuum drying oven, and vacuum reaches 10 in vacuum drying oven-1Begin to warm up after MPa, added with the heating rate of 5 DEG C/min
Heat is to 800 DEG C（The eutectic temperature of AgCu eutectic solders, may according to stove difference and the somewhat difference of solder component, this temperature
Have difference）, 1min is kept the temperature, furnace temperature is then down to 680 DEG C, keeps the temperature 60min, subsequent furnace cooling.After taking out spreading
PDC, forms a complete seaming zone, and the hard alloy surface of seaming zone and its both ends after the heated insulation of mechanical mixture powder
Engagement is good.
Claims (9)
1. the connection method of a kind of PDC and hard alloy, it is characterised in that comprise the following steps：
Step 1: the connected face of PDC and hard alloy is cleaned respectively, wherein, the non-PCD ends of PDC are connected for it
Face, after air-drying, obtains the PDC and hard alloy of cleaning, spare；
Step 2: the method being modified using surface respectively carries out the PDC after step 1 cleaning and the connected face of hard alloy
It is modified, the connected face of PDC and hard alloy is formed one layer of nickel coating；
Step 3: placing one layer of solder between step 2 PDC after modified and the connected face of hard alloy, assembled
Component, it is spare；
The solder is less than 800 DEG C of AgCu solders for liquidus curve；
Step 4: assembling assembly made from step 3 is positioned in vacuum drying oven, it is 10 to be evacuated to vacuum in stove-1~10- 3MPa, afterwards, control the temperature in vacuum furnace are increased to 775~800 DEG C with certain heating rate, and keep the temperature 1 at such a temperature
~3min, then, control the temperature in vacuum furnace are cooled to 680~710 DEG C, and carry out 40~80min of insulation at such a temperature, it
Afterwards, the temperature in vacuum furnace cooled to room temperature is controlled, assembling assembly is taken out, that is, completes the connection between PDC and hard alloy.
2. the connection method of a kind of PDC according to claim 1 and hard alloy, it is characterised in that：It is right in step 1
The method that the connected face of PDC and hard alloy is cleaned is：PDC and hard alloy are put into and are placed in ethanol solution
Carry out 10~15min of ultrasonic cleaning.
3. the connection method of a kind of PDC according to claim 1 and hard alloy, it is characterised in that：In step 2, institute
The thickness for stating nickel coating is 0.1-2mm.
4. the connection method of a kind of PDC according to claim 1 and hard alloy, it is characterised in that：In step 3, institute
AgCu solders are AgCu eutectic solders.
5. the connection method of a kind of PDC according to claim 4 and hard alloy, it is characterised in that：In step 4, very
Eutectic temperature in empty stove using the maximum temperature that certain heating rate heats up as AgCu eutectic solders.
6. the connection method of a kind of PDC according to claim 1 and hard alloy, it is characterised in that：In step 4, very
After being warming up to maximum temperature in empty stove with certain heating rate, the time of insulation is 3min.
7. the connection method of a kind of PDC according to claim 1 and hard alloy, it is characterised in that：In step 4, very
Temperature after empty descent of temperature is 710 DEG C, and soaking time at such a temperature is 80min.
8. the connection method of a kind of PDC according to claim 1 and hard alloy, it is characterised in that：In step 4, institute
The heating rate stated is 5-15 DEG C/min.
9. the connection method of a kind of PDC and hard alloy, it is characterised in that comprise the following steps：
Step 1: the connected face of PDC and hard alloy is cleaned respectively, wherein, the non-PCD ends of PDC are connected for it
Face, after air-drying, obtains the PDC and hard alloy of cleaning, spare；
Step 2: placing one layer of metal powder between PDC of the step 1 after over cleaning and the connected face of hard alloy, obtain
Assembling assembly, it is spare；
The metal powder is the mechanical impurity of AgCu eutectic solders powder and nickel powder, wherein, nickel powder accounts for metal powder gross mass
15%-20%；
Step 3: assembling assembly made from step 2 is positioned in vacuum drying oven, it is 10 to be evacuated to vacuum in stove-1~10- 3MPa, afterwards, control the temperature in vacuum furnace are increased to 775~800 DEG C with certain heating rate, and keep the temperature 1 at such a temperature
~3min, then, control the temperature in vacuum furnace are cooled to 680~710 DEG C, and carry out 40~80min of insulation at such a temperature, it
Afterwards, the temperature in vacuum furnace cooled to room temperature is controlled, assembling assembly is taken out, that is, completes the connection between PDC and hard alloy.
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|---|---|---|---|---|
| CN109514017B (en) * | 2018-11-28 | 2022-06-28 | 自贡中兴耐磨新材料有限公司 | Vacuum diffusion welding process for hard alloy and steel |
| CN110449678B (en) * | 2019-07-23 | 2021-05-18 | 河南机电职业学院 | Brazing method for improving connection strength of PDC and steel matrix |
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